I was partially involved in this as I was on the 1635 1W33 Waterloo-Weymouth service which I suspect caused this. I've scan-read all of this thread and I don't think I'm repeating information here.
1W33 departed Waterloo 17 late and continued to pick up delays on its journey south. At Southampton Central, it split, with the front 5 running fast (Brockenhurst, Bournemouth and stations to Weymouth), and the rear 5 forming 2B51, a slow service calling almost all stations to Bournemouth. 1W33 departed Southampton 71 late and was immediately stopped by a points problem just outside the station. 2B51 was allowed to overtake (60 late). 1W33 reversed back to Southampton and took a different route, bypassing the faulty points.
1W33 ran at a good speed until it caught up with 2B51, which was limited to 20 mph as it had a faulty horn (apparently). Just outside Christchurch, we came to a stop and stayed there for what seemed like a long time. Eventually the guard told us that 2B51 had completely failed just outside Christchurch station and we were going to try to push it out, all the way to Bournemouth (non-stopping Pokesdown). We proceeded at walking pace through Christchurch station and connected up to 2B51. (1W33 was 201 late at this point - it had passed the previous station, Hinton Admiral, 124 late). The drivers gave it a good go but there didn't seem to be enough traction, and after much wheelspin, the attempts were abandoned. A short time later, the entire service was abandoned, and as the rear couple of carriages were still on the platform at Christchurch, I took the option to leave the train there and get a lift.
RTT says 1W33 arrived at Bournemouth 296 late, 95 minutes after the push-out attempt at Christchurch.
I suspect that while all this was going on, the 1705 and 1735 were sat behind us, and the third rail was slowly icing over...
I do wonder how they got 1W33 going again? Possibly they were able to disable some safety system and get the train moving in a condition where it could run as ECS, but wouldn't be able to run if it had passengers on-board? Does Bournemouth have any diesel locos? I wondered if they would run one on the down line up to Christchurch and haul us down to Bournemouth (where presumably 1W33 would have continued to Weymouth).
Funnily enough, before the push-out attempt, I remembered an incident where a 442 failed in *exactly* the same place as 2B51 one evening on a weekend. I was on the train behind and we had a wait while staff tried to get it moving again. I don't remember if we pushed it out or not; I think it got moving under its own power again.
RTT - 1635:
1W33 and
2B51.
RTT - 1705:
1W75
RTT - 1735:
1W35